Curb and gutter extruding machine



Sheet v of 4 Q \w\ wwm of; N M5 M W\\ .m w m\ 0. few M3 2 5 Y L 2 u, 26a B. F. HANDY, JR, ETAL CURB AND GUTTER EXTRUDING MACHINE Filed Feb. 2,1967 Feb. 18, 1969 NQ Mm MQ ETAL 3,427,938 CURB AND GUTTER EXTRUDINGMACHINE Feb. 18, 1969 a. F. HANDY, JR.

Fziled Feb. 2, 196 Q4 E5602? 6. Haw/-10? lzwsuroes. BY

Feb. 18, 1969 B. F. HANDY, JR., ETAL 3,427,938

CURB AND GUTTER EXTRUDING MACHINE Filed Feb. 2, 1967 II II II II IIBY/z'cw 1f HAM/09 Jia. ALLEN R Hquav 0/256 025 S. Ham

' INVENTORS. BY 4%; a

F 8. 1969 a. F. HANDY, JR, ETAL 3,427,938

CURB AND GUTTER EXTRUDING MACHINE Filed Feb. 2, 1967 Sheet 4 Bree/v IfHANDY, J52. 5 ALLENR HONEY Gessoev .5. Howey INVENTORS.

lQTTOENE'V.

United States Patent O 3,427,938 CURB AND GUTTER EXTRUDING MACHINE ByronF. Handy, Jr., Allen R. Handy, and Gregory S. Handy, Riverside, Calif.,assignors to BAS Equipment and Manufacturing Co., Inc., Riverside,Califi, a corporation of California Filed Feb. 2, 1967, Ser. No. 613,648U.S. CI. 94-46 Int. Cl. E01c 19/48 6 Claims ABSTRACT OF THE DISCLOSURE Atravelling rail supported fluid concrete hopper from the bottom of whichsaid concrete is screw-fed rearwardly through a curb extruding shoe toform on the soil at finished curb and having a vertical power ram forinstalling transversely in said curb and at suitable intervalslengthwise thereof a sheet expansion joint element.

BACKGROUND OF THE INVENTION Field of invention Development of methodsand power tools for rapid machine production of concrete curbing atopposite side edges of public thoroughfares.

Description of the prior art Known prior US. patents include: (1)Leatherman, 2,204,021, June 11, 1940; (2) Canfield et al., 2,818,790,Jan. 7, 1958; (3) OConnor Jr., 3,108,518, Oct. 29, 1963; (4) Smith,3,138,079, June 23, 1964; (S) Larsen et al., 3,161,116, Dec. 15, 1964;(6) Supject, 3,161,117, Dec. 15, 1964; (7) Sigmund, 3,208,362, Sept. 28,1965; (8) Jones et al., 3,223,006, Dec. 14, 1965.

The machines of prior art patents (l), (3), (5), and

(7) travel'on rails formed by longitudinal curb mold members, whichconfine opposite side edges of the curb as it is molded therebetween.

The machines of prior art patents (2), (4), (6), and

I (8) are supported on wheels or track-laying devices rest- SUMMARY OFTHE INVENTION The present invention provides a vertically adjustablepair of tracks spaced laterally from side edges of the hopper and thecurb extruding shoe and the latter are supported on said tracks formovement along the true grade established by the tracks for depositingthe curb directly on the ground.

Another unique feature of the present invention is the bottomless hopperthereof in which the earth itself forms the bottom so that the voids inthe surface portion of the soil which will subsequently underlie thecurb are filled with fluid concrete while this soil is under the hopper.This results in a tendency of the curb to retain the shape given it bythe extruder shoe because a good union is produced between the body ofconcrete to be used in forming the curb and thesupporting soiltherebeneath before the form of the curb is given said concrete by saidextruder shoe.

A further unique feature of the invention is the provision of a powerram optionally operable at selected intervals along the curb extruded bythe machine to install transversely in said curb a sheet expansion jointelement.

Cit

-15 which is designed to travel on parallel rails BRIEF DESCRIPTION OFTHE DRAWING The manner of accomplishing the foregoing objects as well asfurther objects and advantages will be made manifest in the followingdescription taken in connection with the accompanying drawings in whichFIGURE 1 is a diagrammatic side elevational view of a preferredembodiment of the invention.

FIGURE 2 is a plan view of FIGURE 1..

FIGURE 3 is an end elevational view of FIGURE 1 taken in the directionof arrows 3.

FIGURE 4 is a transverse sectional view taken on the line 4-4 of FIGURE1.

FIGURE 5 is an enlarged fragmentary horizontal sectional view taken onthe line 5-5 of FIGURE 1.

FIGURE 6 is a transverse vertical sectional view taken on the line 6-6of FIGURE 2.

FIGURE 7 is a diagrammatic vertical sectional view taken on the line 7-7of FIGURE 2 and illustrates the vertical ram of the invention inelevated position with a sheet expansion joint element poised forinsertion through the vertical slot for receiving the same into aposition beneath said ram in readiness to be delivered downwardlythrough the liquid concrete in the machine into a transverse dividingrelation within the cur-b being extruded by said machine.

FIGURE 8 is a view similar to FIGURE 7 showing said element positionedbeneath said ram and with the latter lowered so as to embody saidelement with said curb.

FIGURE 9 is an enlarged horizontal fragmentary detail view taken on theline 9-9 of FIGURE 6, this view illustrating the internal structure ofsaid ram and showing an expansion joint element aligned for insertionthrough the vertical slot in the side of the machine for admission tothe chamber of the said ram for receiving said element prior to theoperation of the ram to install said element in the curb being extrudedby said machine.

FIGURE 10 is an enlarged fragmentary vertical longitudinal sectionalview taken on the line 10-10 in FIG- URE 4 and illustrates said ram inraised position in readiness to receive an expansion joint elementtherebeneath.

FIGURE 11 is a view similar to FIGURE 10 and is taken on line 11-11 ofFIGURE 4, this view showing said ram with an expansion joint elementinserted therebeneath and with the ram lowered to its downward-mostposition, thereby installing said element in a curb being formed by theinvention.

FIGURE 12 is an enlarged fragmentary detail sectional view taken on theline 12-12 of FIGURE 1 and shows the miter gears through which theconcrete screw conveyors are power-driven.

DESCRIPTION OF THE PREFERRED EMBODIMENT This embodiment comprises a curbextruding machine preferably be supported by and 16 and 17 which areprovided on opposite sides of a path 18 provided by the upper surface ofthe soil 19 on which the machine 15 is provided to extrude in situ aconcrete curb 20.

Each of the rails 16 and 17 is made up in twenty foot lengths, eachlength comprising a flat steel bar with clamps 21 welded thereto atspaced intervals and disposed outwardly from these rails. Each clamp 21is vertically aper' tured to slidably receive a fiat steel stake 22 towhich the clamp is adjustably secured by a wing-headed screw 23. Thestakes 22 are inserted downwardly through the clamps 21 and driven intothe ground while the screws23 are loose. The clamps 21 are thentightened on these stakes so as to set the rails 16 and 17 at a desiredlevel and grade so that when machine 15 is operated on these rails itwill be properly related to the soil 19 to extrude the curb 20 thereon.

The rail 17 has an industrial sprocket chain 24 secured to the innerface thereof at a suitable distance below the upper edge of this rail soas to extend the entire length of the rail. This chain of course is alsodivided into sections each section being coextensive with the twentyfoot length of rail 17 to which it is secured. The securing of thischain to the rail 17 is done by welding about every fourth or fifth linkof the chain to the rail so that there is a slight degree of slacknessin the portions of the chain 24 between such points of attachment. Thepurpose of this will be made clear hereafter.

The machine 15 has a body 25 the principal elements in which are aliquid concrete hopper and a curb extruding shoe 31. The hopper hasfront and rear vertical end walls 32 and 33 which are connected togetherby welding at their opposite ends to the opposite ends of sidewalls 34and 35.

The lower portion of rear end wall 33 is shaped to serve as a screedhaving the same transverse contour as the curb 20 to be extruded by themachine.

The shoe 31 has sidewalls 36 and 37 and a top wall 38 and the shoe 31 isshaped so as to fit the rear end of the hopper 30 and has a transverseconformation so that the inner surface of this conforms to the shape tobe given the curb 20. Thus, sidewalls 36 and 37 form rearward extensionsof sidewalls 34 and of hopper 30 and the inner surface of top wall 38conforms to the contour of the lower edge of rear end wall 33 of hopper30 when the hopper and shoe are secured together to form the body 25.This assembly of these two elements is effected by the welding of anglebrackets 39 and 40 respectively on said hopper and shoe on oppositesides of the transverse plane where these elements meet and near thelower ends and uniting these brackets with bolts 45. Other anglebrackets 46 are welded on the top wall 38 of shoe 31 which are securedto the rear end wall 33 of hopper 30 by cap screws 47 extending throughapertures in these brackets and screwed into suitable tapped holesprovided in the said end wall.

The rear end of curb extruding shoe 31 is preferably reinforced by aflange 48 welded to and extending outwardly from the rear open end ofsaid shoe.

The body 25 is supported on rails 16 and 17 by three double flangedwheels 49 which rotate idly on axles 50 supported by channel brackets 51welded to the sides of the body and by a power-driven sprocket-flangedwheel 52 having sprocket 53 serving thereon as a flange and meshing withchain 24 on rail 17. The wheel 52 is fixed to a rotatable hollow shaft54 which carries a sprocket 55 by which this shaft is rotated in amanner which will be made clear hereinafter.

One pair of the double flanged wheels 49 ride on rail 16 while the otherdouble flanged wheel 49 and the sprocket-flanged wheel 52 ride on rail17 and the body 25 of machine 15 is thus supported on these two railsfor travel thereon.

The machine 15 is provided with a power-driven vertical ram for use inthe operation of this machine for the purpose of ramming a sheetexpansion joint element 61 downwardly into the liquid concrete passingthrough said machine during its operation so that this element willtransversely divide the adjoining sections of the concrete curb 20extruded from said machine. A false end wall 62 is welded in place inhopper 30 between the sidewall 34 and 35 thereof in close spacedrelation with rear end wall 33 of said hopper so as to provide a narrowtransverse well 63 between the walls 62 and 33 in which an expansionelement depressing blade 64 of said ram may reciprocate vertically inperforming its function. This blade is preferably made up of arectangular sheet of steel about /2 inch in thickness, the outline ofwhich is clearly shown in FIGURE 7. The lower edge 65 of this blade ispreferably sharpened so as to facilitate its penetrating the liquidconcrete immediately therebeneath when performing its function ofsetting an expansion joint element 61 in the concrete curb 20. The blade64 is guided in its vertical movement in the well 63 by interengagementof angle guides 66 and 67 which are welded respectively on the blade 64and on the false end wall 62 so as to closely interfit with each otheras shown in FIGURE 9. The blade 64 is thus guided vertically in thechamber 63 so as to be spaced from the hopper rear end wall 33 aslightly greater distance than the thickness of a sheet expansion jointelement 61. This space comprises a ram chamber 68 for receiving anexpansion joint element 61 through a vertical slot 69 formed in theplane of this chamber in hopper side wall 35. Extending rearwardly fromblade 64 into ram chamber 68 is a bar 70 preferably formed of /2 inchsquare rod welded to the rear face of said blade, this rod being bent toconform to the upper edge of a joint element 61 when the latter isinserted into chamber 68 and is slidably related to rear end wall 33 ofhopper 30 during the operation of blade 64.

Vertical movement of the blade 64 in the well 63 is effected by a rackbar 74 made of inch square stock with the rack teeth 75 facingrearwardly therefrom. A certain lower portion of this rack bar isrecessed about half the thickness of the bar so it will interfit withthe upper portion of blade 64 and the bar is thus welded to said blade.A deep notch 76 is formed in the upper edge of rear hopper wall 33 so asto permit the rack teeth 75 to mesh with a gear 77 mounted on the innerend of a shaft 78 which journals in bearings 79 fixed to the rear faceof wall 33. The adjacent end of said wall has an upward extension 80 onwhich bearings 81 are mounted in which a jack shaft 82 journals. Theinner end of shaft 82 is in parallel overlapping relation with the outerend of shaft 78 and has a driving connection therewith through radiallyaligned sprockets mounted on said overlapping shaft ends which areconnected by an endless chain 83. Fixed on the outer end of jack shaft82 is a sprocket 84.

Mounted on the forward face of front end wall 32 of the hopper 30 is aheavy sheet metal box 85 in which are mounted aligned pairs of bearings(in which a shaft 91 is journaled); 92 (in which a shaft 93 isjournaled); and 94 (in which a shaft 95 is journaled). Connectedintegrally with bearings 94 by webs 96 is an aligned upper pair ofbearings 97 in which a shaft 98 journals. The aforesaid pairs ofbearings 90, 92, 94, and 97 support the shafts 91, 93, 95 and 98 inhorizontal parallel relation and apertures are provided in front wall 32of the hopper 30 through which these shafts extend into said hopper,where said shafts are provided with conveyor screws 99.

Mounted within the bearing box 85 on the shafts 91, 93 and 95,respectively, are a single sprocket 100, a double sprocket 105, andsingle sprocket 106. Endless chains 107 and 108 connect the doublesprocket respectively to the single sprockets 100 and 106 so thatrotation of shaft 95 through a double sprocket 109 mounted on the outerend thereof also causes rotation of shafts 91 and 93. Through a chain110 which connects double sprocket 109 with a sprocket 111 mounted onthe forward end of shaft 98, rotation of shaft 95 also causes acorresponding rotation of shaft 98.

The machine 15 has a power-and-transmission unit 112 which, in theillustrated embodiment of the invention, is mounted on a platform 113which extends forwardly from and is rigidly secured to the front endwall 32 of the hopper 30. Mounted in confronting relation on oppositesides of platform 113 is a ten horsepower gasoline engine 114 and atransmission 115 the latter being preferably of the type used in a 1965Chevrolet Corvair automobile. The engine 114 has a small diameter drivepulley which is connected by a belt 121 to a large driven pulley 122mounted on a jack shaft 123 which journals in bearings 124 mounted onplatform 113, said shaft having a relatively small diameter sprocket125.

The transmission is controlled by a lever 126 to offer the option ofthree forward drive ratios and one in reverse. This transmission has ahollow output shaft 127 carrying a sprocket 128, and an input shaft 129which connects through a clutch 130, controlled by lever 135, with asprocket 136 which is radially aligned with and connected with thesprocket by an endless chain 137. When the engine 114 is running so asto rotate the jack shaft 123 and the sprocket 136, and the lever ismoved to engage clutch 130, the input shaft 129 of the transmission 115is rotated thereby causing rotation of the output shaft 127 and sprocket128 in the direction and at the drive ratio determined by the positionof lever 126.

Mounted on suitable brackets welded to and extending forwardly from anupper portion of hopper front end wall 32 are three aligned bearings138, 139, and 140 in which a shaft 141 journals. This shaft has fixedthereon a sprocket 142 which is radially aligned with sprocket 128 onthe output shaft 127 and connected thereto by an endless chain 143.Three manually controlled clutches 144, 145, and are mounted on shaft141 which are adapted to transmit rotational movement, respectively,through endless chains 151, 152 and 153, the latter chain connectingclutch 150 with sprocket 84 on jack shaft 82.

Endless chain 152 connects manual clutch 145 with a short jack shaft 154which is journaled in a suitable bearing 155 provided on front end wall32 and which has a sprocket 156 which is connected by an endless chain157 to a double sprocket 158 which is pivotally mounted on side wall 35and is in turn connected by an endless chain 159 to a double sprocket160, also pivotally mounted on sidewall 35, and which in turn isconnected by an endless chain 161 to the sprocket flange 53 of thedrivewheel 52 of the machine 15.

Manual clutch 144 is connected by endless chain 151 to a sprocket 166mounted on one end of a shaft 167 which journals in a bearing 168supported on platform 113. This shaft has on its opposite end a mitergear 169 which meshes with another miter gear 170 provided on the rearend of a shaft 171 which journals in bearings 172 mounted on platform113 and which has, at its front end, a sprocket 173 which is connectedby an endless chain 174 to double sprocket 109 provided on the forwardend of shaft 95.

From the foregoing description it should be evident that when manualclutches 144, 145 and 150 are disengaged, by manually actuating thehandles respectively associated therewith, the engine 114 may beoperated with the clutch 130 engaged so as to deliver power through theinput shaft 129- to the transmission 115 and thus cause output shaft 127and sprocket 128 thereon to rotate thereby rotating the main clutchshaft 141 without power being transmitted from the latter to any of theoperative elements of the machine 15. When the shaft 141 is thus beingrotated, and clutch 144 is manually engaged, this will produce rotationof shaft 95 which rotation is transmitted as already described to shafts91, 93 and 98 on which conveyor screws 99 are mounted.

When shaft 141 is power-driven and idling and manual clutch 145 isengaged this will transmit rotation from shaft 141 to drive wheel 52which will cause the machine 15 to start travelling along the rails 16and 17, the direction of this travel depending upon whether transmission115 has been set by manipulation of lever 126 to transmit rotation tooutput shaft 127 in one of three forward speeds or in reverse.

When main clutch shaft 141 is idling and clutch 150 is manually engagedthis will cause rotation of shaft 78 and gear 77 mounted thereon, whichmeshes with rack teeth 76 and, if transmission 115 is set to operate inone of its forward speeds, this engagement of clutch 150 will rotategear 77 in an anticlockwise direction as seen in FIGURE 11 so as topropel the ram blade 64 downwardly from its upper position, in which itis shown in FIGURE 10, to its downward position as shown in FIG- URE 11.When the blade 64 arrives in the latter position, it is halted fromfurther downward movement by a lug 175 welded on one side of rack bar 75engaging the bottom of the notch 76 formed in the upper edge of rearupper end wall 33.

In order to elevate ram blade 64 from its lower position as shown inFIGURE 11 to its upper position as shown in FIGURE 10, the transmission.115 is manually shifted into reverse while the main clutch shaft 141 isidling and clutch 150 is then manually engaged to cause a reverserotation of gear 77 until the raising of blade 64 to its upper positionhas been effected.

Operation For convenience a boom-equipped truck is provided for handlingthe machine 15 on the job and for trans porting it from place to place.

The first step in the operation of this machine for extruding curb 20 ona given job is the surveying of the path along which the curb is to belaid and the setting up of the rails 16 and 17 along opposite sides ofthis path and in the proper spaced parallel relation and the setting ofthese rails at exactly the desired grade so that travel of the machine15 along these rails: will cause this machine to traverse said path inthe proper parallel relation with the surface of the soil 19 within saidpath so that the normal operation of the machine while so travelling andwhich will now be described will result in the extruding of the concretecurb 20 which it is desired to produce in said path. It should be notedat the outset, that the rails 16 and 17 are installed so as to start asufiicient distance in advance of the point where the curb 20 is tostart that the machine 15 may overlie this starting point with thelatter approximately in the transverse plane of the ram blade 64.

To begin with, the machine 15 is hoisted by the boom of the auxillaryservice truck and set on rails 16 and 17 in advance of the point atwhich the curb is to begin. A sheet expansion joint element 61 is nowset up on the soil transversely of the path in which the curb 20 is tobe extruded and at the point of beginning of said curb and this elementis backed up by suitable stakes 177 (shown in broken lines in FIGURE 11)which are driven into the soil 19 behind said element and wired theretoso as to hold said element erect so it will serve as the initial endpiece of the curb 20.

The machine 15 is now driven in reverse to back the same along the rails16 and 17 with the ram blade 64 lowered as shown in FIGURE 11 until thisram blade engages the endmost element 61 as shown in this view,whereupon the rearward movement of the machine 15 is halted.

It is to be noted at this time that the lower ends of both the liquidconcrete hopper 30 and the curb extruding shoe 31 are open and that thelower edges of the sidewalls of the hopper and the shoe are held by thesetting of the rails 16 and 17 in closely spaced parallel relation withthe path 18 on the soil 19 on which the curb is to be extruded.

A ready-mixed concrete delivery truck now takes up a position alongsidethe machine 15 and delivery of liquid concrete into the hopper 30 isstarted. When the hopper is about two-thirds full of liquid concrete andwith the transmission 115 set in reverse drive, and with the main clutchshaft 141 running idle, manual clutch 150 is engaged to rotate gear 77in a clockwise direction as shown in FIGURES l and 11 thereby liftingthe ram blade 64 from its lower most position as shown in FIGURE 11 toits upper position as shown in FIGURE 10 thereby allowing the liquidconcrete in the hopper 30 to bear directly on the expansion jointelement 61 which is resting against the stakes 167 to mark the beginningpoint of the concrete curb 20.

As soon as the ram blade 64 has thus been. raised to its upper position,clutch 150 is manually disengaged, transmission 113 is shifted fromreverse into low speed forward so that the shaft 141 now idles in acounterclockwise direction. Clutches 145 and 144 are now manuallyengaged in that order so as to start the machine travelling forwardlyaway from the starting point of the curb marked by the stakes 177 and, amoment later, to start the conveyor screws 99 turning in a direction toset up a rearward current of the liquid concrete in the lower portion ofthe hopper 30. This causes concrete from the lower portion of the hopperto be constantly packed into the forward end of the curb extruding shoe31 thus keeping this shoe continuously packed full of liquid concreteunder pressure as the travel of the machine 15 progresses.

Successive portions of the curb 20 which are formed by the extrudingshoe 31 and are left standing on the soil 19 as the shoe moves from overthese portions, are found to possess the hard smooth finished surfacewhich is requisite in this kind of work.

The ready-mix concrete truck supplying liquid concrete to the machine 15travels alongside this and regulates the delivery of such concrete tothe machine so as to keep liquid concrete in the hopper at the desiredlevel. Markers are provided at spaced intervals along the path 18indicating points where it is desired to introduce into the curb 20 oneof the expansion joint elements 61, and the machine is stopped in itstravel, whenever such a marker is reached by the ram 60, by manuallydisengaging clutches 144 and 145. This leaves the main clutch shaft 141idling in a forward direction. Inasmuch as the ram blade 64 is now inits elevated position as shown in FIGURES 7 and 10, and element 61 maybe poised as shown in FIGURE 7 opposite the slot 69 provided forreceiving the same and manually inserted lengthwise into the ram chamber68 where the upper edge of the element is engaged by the shoulder 70which extends rearward from the ram blade 64. As soon as the element 61has thus been completely inserted into ram chamber 68, the clutch 150 ismanually engaged which rotates gear 77 in a counterclockwise directionthereby depressing ram bade 64 and element 61 in the chamber 68downwardly into curb 20 as shown in FIGURE 11. Immediately upon thishaving been accomplished, the transmission is reversed which rotates thegear 77 in a clockwise direction thus returning the ram blade 64 to itsupper position and leaving the element 61 installed in the curb.

The clutch 150 is now disengaged, the transmission reset to drive shaft141 forwardly in low gear and clutches 145 and 144 are again engagedmanually in that order to produce forward movement of the machine 15along the rails 16 and 17 and to resume rotation of the conveyor screws99.

It is to be noted that the machine 15 will travel around a curve inwhich the outside track has a sevent foot radius. Whenever the machine15 arrives at a driveway area where it is desired to eliminate the curbportion 180 which stands above the gutter portion 181 of the curb, thisis accomplished by throwing in the clutch while the machine istravelling forwardly and thus lowering the ram blade 64 just far enoughdownwardly to accomplish a striking-off operation of the higher portionof the curb while the machine 15 is travelling through said drivewayarea. When the machine arrives at the opposite edge of this area, it ishalted by disengaging the clutches 144 and 145, reversing the directionof rotation of the drive shaft 141, with this idling, and then engagingclutch 150 to return the ram blade 64 to its upward position whereuponthe clutch 150 is disengaged, the transmission 115 reset in low forwarddrive and the clutches 145 and 144 again manually engaged in that orderto resume forward movement of the machine 15 and start screw conveyors99 rotating.

The slackness provided in chain 24 between adjacent points at which thisis attached to rail 17 is for the purpose of permitting the latter to beset up so as to guide the machine 15 in extruding curb 20 around acurve. The

chain 24 is thus rendered relatively taut when rail 17 is on the insideof a curve and has an increased degree of looseness when rail 17 is onthe outside of a curve. These changes in tautness of chain 24 have notbeen found to interfere with the satisfactory engagement of the teeth ofsprocket flange 53 with the links of said chain in causing poweredtravel of the machine 15 over rails 16 and 17.

We claim: 1. A curb extruding machine comprising a concrete hopper; acurb extruding shoe connecting to a lower portion of said hopper andextending rearwardly therefrom;

rail means for supporting said hopper and shoe for travel along aparticular grade conforming to the path in which said curb is to beextruded;

and horizontal screw means in said lower portion of said hopper fordelivering fluid concrete horizontally from said hopper into said shoeas said machine travels on said rail means;

wherein the improvement resides in said hopper and shoe both being openat the bottom with said open bottoms being disposed close to the soiltherebeneath so that the fluid concrete at the bottom of the hopper ispressed, by the fluid head imposed thereon, into the surface voids ofsaid soil therebeneath and remains in place to be given the shape of acurb by said shoe.

2. A curb extruding machine as recited in claim 1 wherein ram means isprovided on said machine for forcing a sheet expansion joint elementthrough the liquid concrete passing through said machine to install saidelement transversely in the curb formed of said concrete.

3. A curb extruding machine as recited in claim 2 wherein said ram meansis located to function in a vertical plane at the point where saidliquid concrete is delivered horizontally from said hopper into saidshoe. 4. A curb extruding machine as recited in claim 3 wherein said rammeans includes a vertically reciprocable plunger comprising;

a concrete parting curb and shoulder means on said blade which conformto the contour of and engage the upper edge of said element to carry thelatter downwardly through said liquid with said blade.

5. A curb extruding machine as recited in claim 4 wherein said hopperhas side walls and front and rear end walls and said shoe has side wallscomprising of said hopper sidewalls and a shaped upper wall reflectingthe transverse contour of said curb;

means for guiding said blade in close spaced parallelism with said rearhopper end wall with said shoulder means occupying the spacetherebetween, there being a vertical slot in one of said hoppersidewalls in alignment with said space for the introduction of anexpansion joint element into said space beneath said shoulder means whensaid blade is in raised position. 6. A curb extruding machinecomprising: a concrete hopper; a curb extruding shoe connecting to alower portion of said hopper and extending rearwardly therefrom;

means for supporting said hopper and shoe for travel along a path inwhich said curb is to be extruded; and

screw means in said hopper for delivering fluid concrete from saidhopper into said shoe as said machine travels along said path whereinthe improvement resides in the provision of ram means for forcing asheet expansion joint element blade coextensive in width with said 10through the liquid concrete passing through said ma- 2,932,875 4/ 1960Butcher 9446 chine to install said element transversely in the 3,137,2206/1964 Smith 4 curb formed of said concrete. 3 175 477 3/1965 CheneyReferences 5 Cheney UNITED STATES 3,318,208 5/1967 DUI'StOIl 94-442,049,115 7/1936 Hadley 9 NILE C. BYERS, 111., Primary Examiner.

2,707,422 5/1955 Canfield 94-46

